[Interest] Conflicting libjpeg versions

[Olivier B.]

In that case it's at your app's link time that you have to make sure you
link to the same libjpeg qt used. If both Qt and your app use a static
libjpeg in the same executable, it must be the same

2016-03-29 17:00 GMT+02:00 Etienne Sandré-Chardonnal <etienne.sandre at m4x.org
>:

> I will try recompiling Qt. Is there any way to check the actual files Qt
> is linked against?
>
> I was not clear in my original post. The error message is not triggered
> when I use Qt for reading a jpeg, but when I'm directly using the libjpeg
> API.
>
> Etienne
>
> 2016-03-29 16:55 GMT+02:00 Olivier B. <perso.olivier.barthelemy at gmail.com>
> :
>
>> oops, ignore my 2nd sentence, i mixed up png and jpeg
>>
>> 2016-03-29 16:51 GMT+02:00 Olivier B. <perso.olivier.barthelemy at gmail.com
>> >:
>>
>>> I do -system-libjpeg -I ${ENV_LIBJPEG_PATH}/include -L
>>> ${ENV_LIBJPEG_PATH}/lib  on my configure line to use my own libjpeg
>>> version.
>>> I also sed in qtbase/src/3rdparty/png_dependency.pri between debug and
>>> release build, in order to use a debug libjpeg in my debug qt and a release
>>> libjpeg in my release qt
>>>
>>> If you build a static Qt, it is written in Qt static libs at qt build
>>> time that they need 62. But actual linking with libjpeg is done at link
>>> time of your exe. So if the path to the wrong libjpeg is passed at
>>> executable llink time, you might get the error you are seing at runtime
>>>
>>> 2016-03-29 16:45 GMT+02:00 Etienne Sandré-Chardonnal <
>>> etienne.sandre at m4x.org>:
>>>
>>>> Hi,
>>>>
>>>> There is no dependency to any libjpeg DLL, as checked with dependency
>>>> walker. And I have searched for any libjpeg*.dll in my system, none of them
>>>> are inside the PATH. The libjpeg is linked statically.
>>>>
>>>> Which options do I have for configuring Qt? I only know the option
>>>> which switches between embedded libjpeg and system libjpeg, and using the
>>>> latter should normally make Qt use the 6.2 that is installed in the
>>>> compiler folders (include/lib)
>>>>
>>>>
>>>>
>>>>
>>>> 2016-03-29 16:24 GMT+02:00 Olivier B. <
>>>> perso.olivier.barthelemy at gmail.com>:
>>>>
>>>>> Either your PATH is set so the wrong libjpeg dll is found first, or qt
>>>>> found the wrong jpeg include first.
>>>>> If you don't care which version is used, set your PATH so that your
>>>>> system libjpeg 6.2 is found first at runtime (or place the libjpeg dll of
>>>>> the version that was detected beside your executable). If you want a
>>>>> specific version, change qt configure options accordingly
>>>>>
>>>>> 2016-03-29 16:18 GMT+02:00 Etienne Sandré-Chardonnal <
>>>>> etienne.sandre at m4x.org>:
>>>>>
>>>>>> Dear all,
>>>>>>
>>>>>> I am compiling under windows with MinGW (64-bit)
>>>>>>
>>>>>> I compiled Qt for static linking. I let the default options for
>>>>>> configure regarding jpeg support, and it seems that it choose using the
>>>>>> system libjpeg (as seen in config.summary), probably because it detected
>>>>>> it. My system libjpeg is the binary shipped by libjpeg-turbo 1.4.2 official
>>>>>> download, installed inside minGW folders. The libjpeg version as in
>>>>>> jconfig.h is 62 (6.2)
>>>>>>
>>>>>> Now when I compile and run my application, libjpeg functions return
>>>>>> the following error message : Wrong JPEG library version: library is
>>>>>> 80, caller expects 62
>>>>>>
>>>>>> So it means that at some point my application was linked (statically
>>>>>> or dynamically) with libjpeg version 80 (8.0)
>>>>>>
>>>>>> If I remove the libjpeg.a from my compiler path, I cannot compile my
>>>>>> application anymore. So it is properly linking against that file, or I am
>>>>>> missing something.
>>>>>>
>>>>>> What could be the issue?
>>>>>>
>>>>>> Thanks...
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
>>>>>
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>>>>
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>>
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